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2011年4月,对本市一家埋地液态CO_2输送管道进行年度检验时发现局部防腐层破损,外表腐蚀严重。经超声波测厚检测,出现大面积减薄,局部剩余壁厚小于2mm,减薄量达到4mm以上。对外防腐层完好处超声波测厚检测为6.0mm。1管道基本资料管道规格:φ88.9mm×6.3mm。管道材质:20#。使用压力:8.0MPa。使用温度:常温。输送介质:液态CO_2。铺设方式:埋地铺设,过河处采用弹性铺设。外表防腐方法:水柏油加玻璃纤维布缠绕。
April 2011, the city of a buried liquid CO_2 pipeline annual inspection found that the partial coating damage, the appearance of serious corrosion. After the ultrasonic thickness measurement, a large area thinning, the local residual wall thickness of less than 2mm, thinning to 4mm above. The integrity of the outer coating thickness ultrasonic testing thickness of 6.0mm. 1 pipeline basic information pipeline specifications: φ88.9mm × 6.3mm. Pipe material: 20 #. Working pressure: 8.0MPa Operating temperature: room temperature. Transmission medium: liquid CO_2. Laying way: Buried laying, crossing the river with flexible laying. Anticorrosion methods: water asphalt plus fiberglass cloth winding.